Piston



Patented Sept. 7, 1926.

WALTER ALBERT KEYES, 'OF SAN FERNADO, CALIFORNIA.

PISTON.

Application filed Eebruary The present inventionV relates to a piston and. is designed to .save compression in an internal combustion engine or any designed engine that relies on compression for eniciency. Y

The piston has several advantages over the type of piston now in common use in being made in two parts. One advantage is that the piston seals the rings on all sides as it wears, and the longer the wear, the better the seal. The structure of this piston does away with the ring grooves now in use on the common type of piston, and thus enables the use of a ring gap protector which fits underneath the ordinary three piston rings. This ring gap protector is made the same width as the combined width of the three rings and prevents the escape of compression past the gap or past the sides of the f rings. 1

Another very important object of the invention is to provide a two-part piston of the class described having spring means associated therebetween for taking up the wear on the piston rings which are held betweeen the two parts.

A still further very important object of theinvention is to provide ya piston of this nature which is exceedingly simple in its construction, strong and durable, reliable,

yinexpensive to manufacture, easy to assemble and disassemble, and otherwise well adapted to the purpose for which it is designed.

With the above and numerous other objects in view as will appear as the description proceeds, the invention resides in certain novel features of construction, and in the combination and arrangement `of parts as will be hereinafter more fully described and claimed. Y

In the' drawing Figure 1 is a sectional view through the piston embodying the features of the inven# tion, and

Figure 2 is a bottom vplan view thereof.

Referring to the drawing in detail it will be seen that 5 designates the head of the piston having the cylindrical skirt 6 extending therefrom.- It is to be noted that the diameter of the skirt 6 is less than the diameter of the head 5 thereby forming the annularY shoulder 7. The skirt 6 is provided with bearings 8 for receiving a wrist pin 9. An outer skirt 10 is slidable over the inner skirt 6- and is formed with an interior annu- 8, 1926. "Serial No. 186,861.

lar flange 11 having a 1plurality of inwardly projecting ears 12 apertured for slidably receiving stud bolts 13 which 'are threadedly engaged in bottom flanges 14 interiorly 60 formed in the skirt 6 and supporting bearings S.' Coil springs 16 are disposed about the stud bolts 13, and nuts 17 are engaged on the lower extremities of the stud bolts 13 for compressing the springs 16, thus urg-V 65 ing the bottom flanges 14j of the skirt 6 downwardly toward the flange 11. A ring` gap protector 19 is disposed about the upper portion of the skirt 6 and a plurality of piston rings 2O are disposed thereover. TheV upper edges of the ring assembly 2O and the protector 19 abut the shoulder 7, whiley the lower edges thereof abut the upper edge of thefskirt 10. The springs 16 urge the. upper edge of the skirt 10 toward the shoul der 7 and consequently as the'ring assembly 19, 2O wears, there will bean automatic compensation for such wear.

To assemble this improved piston, the protector ring 19 is first placed over the skirt 6 in abutment with the shoulder 7. The piston rings 2O are then disposed over the protector ring 19. The wrist pin 9 is placed in the bearings S. The skirt 16 is then slid over the skirt6 so that the stud bolts 13 S5 pierce the apertures of the ears 12. The springs 16 are then placed .on the stud boltv 13, and the nuts 17 placed on said stud bolts f and tightened to tension said spring. The disassembly of the piston will be apparent P without a further description'. s

It is thought that the construction, utility, and advantages of this invention will now be clearly understoodby those skilled in this art v'itlioiit a more detailed description thereof. The present embodiment of the invention has been disclosed in detail because in actual practice it attains the features of advantage enumeratedas desirable in the statement of the inventionv and the above de-v scription. It will be apparent, however, that numerous changes in the details of construction. and in thecombination and arrangement of parts may be resorted towithout departing from the spirit or scope of the invention as `hereinafter claimed, or sacrificing any of its advantages. Y n n -Having thus described my invention.v what I claim as new is:-

- A piston of the class described including a head, a skirt projecting from the head g and having a diameter less than that of the head to forni a shoulder, said skirt adapted to receive piston rings thereabout 1n abutl inent with said shoulder, a second skirt slidable on the lirst Skirt and adapted to abut the piston rings on said lirst skirt, bottom flanges interiorly located in the first Skirt, bearings foi-ined on Said ilanges for receiving ay Wrist pin, an annular flange formed interiorly of the second skirt and provided l0 with inwardly projecting;` apertnred ears,

. 1 studs tlireadedly vengaged y1th Said @ottoni fianffes of the inner skirt and nereinn' the a :D apertnred ears, springs on the studs, and

nuts threaded on the studs for compressing 15 the springs.

In testimony whereof I a'fx my Signature.

VALTER ALBERT KEYES. 

